fix: Published Dashboard without charts don't show up for non admin users

[diegomedina248]

SUMMARY

Dashboards created & published that do not contain charts (most common ones, only with markdown content) don't show up in the dashboard list for non admin users.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before:

Screen.Recording.2022-07-07.at.09.15.16.mov

After:

new.mov

TESTING INSTRUCTIONS

1. Create a dashboard with only markdown content.
2. Publish the dashboard.

The published dashboard should appear in the dashboard list for Alpha users.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #20638 (09cfe07) into master (6b0bb80) will decrease coverage by 11.60%.
The diff coverage is n/a.

❗ Current head 09cfe07 differs from pull request most recent head c56972a. Consider uploading reports for the commit c56972a to get more accurate results

@@             Coverage Diff             @@
##           master   #20638       +/-   ##
===========================================
- Coverage   66.83%   55.22%   -11.61%     
===========================================
  Files        1750     1750               
  Lines       65894    65894               
  Branches     7017     7017               
===========================================
- Hits        44041    36393     -7648     
- Misses      20067    27715     +7648     
  Partials     1786     1786               

Flag	Coverage Δ
hive	53.95% <ø> (ø)
mysql	?
postgres	?
presto	53.81% <ø> (ø)
python	58.79% <ø> (-24.20%)	⬇️
sqlite	?
unit	51.03% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset/dashboards/filters.py	48.75% <ø> (-45.00%)	⬇️
superset/sql_parse.py	95.90% <ø> (-1.17%)	⬇️
superset/utils/dashboard_import_export.py	0.00% <0.00%> (-100.00%)	⬇️
superset/key_value/commands/update.py	0.00% <0.00%> (-88.89%)	⬇️
superset/key_value/commands/delete.py	0.00% <0.00%> (-85.30%)	⬇️
superset/key_value/commands/delete_expired.py	0.00% <0.00%> (-80.77%)	⬇️
superset/dashboards/commands/importers/v0.py	15.62% <0.00%> (-76.25%)	⬇️
superset/datasets/commands/update.py	25.30% <0.00%> (-68.68%)	⬇️
superset/datasets/commands/create.py	29.41% <0.00%> (-68.63%)	⬇️
superset/datasets/commands/importers/v0.py	24.03% <0.00%> (-67.45%)	⬇️
... and 277 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6b0bb80...c56972a. Read the comment docs.